<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>分类参数</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 头部警告区域 -->
      <el-alert
        show-icon
        :closable="false"
        title="注意:只能允许第三级分类设置相关参数"
        type="warning"
      >
      </el-alert>
      <!-- 选择商品区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>请选择商品分类:</span>
          <!-- 选择商品的级联选择器 -->
          <el-cascader
            v-model="selectedCateKeys"
            :options="cateList"
            :props="{
              expandTrigger: 'hover',
              value: 'cat_id',
              label: 'cat_name',
              children: 'children',
            }"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>
      <!-- tabs页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加参数的按钮 -->
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加参数</el-button
          >
          <!-- 动态参数的数据列表 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template v-slot="scope">
                <!-- 循环遍历tag标签 -->
                <el-tag
                  closable
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  @close="handleClose(i, scope.row)"
                  >{{ item }}</el-tag
                >
                <!-- tag标签输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column
              label="参数名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template v-slot="scope">
                <el-button
                  size="mini"
                  type="primary"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  size="mini"
                  type="danger"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加属性的按钮 -->
          <el-button type="primary" size="mini" :disabled="isBtnDisabled"
            >添加属性</el-button
          >
          <!-- 静态属性的数据列表 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template v-slot="scope">
                <!-- 循环遍历tag标签 -->
                <el-tag
                  closable
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  @close="handleClose(i, scope.row)"
                  >{{ item }}</el-tag
                >
                <!-- tag标签输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column
              label="属性名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template v-slot="scope">
                <el-button
                  size="mini"
                  type="primary"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  size="mini"
                  type="danger"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加按钮的对话框 -->
    <el-dialog
      :title="'编辑' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <!-- 添加表单 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 编辑按钮的对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <!-- 编辑表单 -->
      <el-form
        :model="editForm"
        :rules="editFormRules"
        ref="editFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 商品分类列表
      cateList: [],
      // 级联选择框双向绑定到的数组
      selectedCateKeys: [],
      // tabs标签默认激活那个页签
      activeName: "many",
      // 动态参数的数据
      manyTableData: [],
      // 静态属性面板
      onlyTableData: [],
      // 按钮对话框的显示也隐藏
      addDialogVisible: false,
      // 添加参数的表单数据
      addForm: {
        attr_name: "",
      },
      // 添加表单的验证规则
      addFormRules: {
        attr_name: [{ required: true, message: "请输入内容", trigger: "blur" }],
      },
      // 编辑对话框的显示与隐藏
      editDialogVisible: false,
      // 编辑表单的数据对象
      editForm: {},
      // 编辑表单的验证规则
      editFormRules: {
        attr_name: [{ required: true, message: "请输入内容", trigger: "blur" }],
      },
    };
  },
  created() {
    //   获取所有的商品分类
    this.getCateList();
  },
  methods: {
    //   获取所有商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get("categories");
      if (res.meta.status !== 200)
        return this.$message.error("获取商品列表失败！");
      this.cateList = res.data;
      //   console.log(this.cateList);
    },
    // 级联选择器发生改变会触发该事件
    handleChange() {
      // 调用获取列表数据请求
      this.getParamsData();
    },
    // tabs页签点击事件
    handleTabClick() {
      // console.log(this.activeName)
      // 调用获取列表数据请求
      this.getParamsData();
    },
    // 获取参数的列表数据
    async getParamsData() {
      // 如果长度不等于三，则清空选择框的数据
      // 如果是true，则选中的的是三级分类，发送数据请求
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = [];
        this.manyTableData = [];
        this.onlyTableData = [];
        return;
      }
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        {
          params: { sel: this.activeName },
        }
      );
      // console.log(res);
      if (res.meta.status !== 200) return;
      // console.log(res.data)
      // 遍历循环展开行数据
      res.data.forEach((item) => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(",") : [];
        // 控制文本框的显示与隐藏
        item.inputVisible = false;
        // 文本框中输入的值
        item.inputValue = "";
      });
      // 做个判断，activeName === 'many'则获取的是动态参数面板，否则反之
      if (this.activeName === "many") this.manyTableData = res.data;
      this.onlyTableData = res.data;
    },
    // 表单对话框关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields();
    },
    // 点击确定按钮，触发点击事件
    addParams() {
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) return;
        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName,
          }
        );
        if (res.meta.status !== 201)
          return this.$message.error("添加参数失败！");
        this.$message.success("添加参数成功");
        this.addDialogVisible = false;
        this.getParamsData();
      });
    },
    // 点击编辑按钮，触发对话框事件
    async showEditDialog(attr_id) {
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attr_id}`,
        {
          params: { attr_sel: this.activeName },
        }
      );
      // console.log(res);
      if (res.meta.status !== 200)
        return this.$message.error("表单数据获取失败！");
      this.editForm = res.data;
      this.editDialogVisible = true;
    },
    // 编辑对话框关闭事件
    editDialogClosed() {
      this.$refs.editFormRef.resetFields();
    },
    // 点击确认按钮，修改参数信息
    editParams() {
      this.$refs.editFormRef.validate(async (valid) => {
        if (!valid) return;
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName,
          }
        );
        // console.log(res);
        if (res.meta.status !== 200) return this.$message.error("编辑数据失败");
        this.$message.success("编辑数据成功");
        this.getParamsData();
        this.editDialogVisible = false;
      });
    },
    // 根据id删除对应的参数项
    async removeParams(attr_id) {
      const confirmResult = await this.$confirm(
        "此操作将永久删除该参数, 是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning",
        }
      ).catch((err) => err);
      // 用户取消删除操作
      if (confirmResult !== "confirm") return this.$message.info("已撤消删除");
      // 删除业务逻辑
      const { data: res } = await this.$http.delete(
        `categories/${this.cateId}/attributes/${attr_id}`
      );
      if (res.meta.status !== 200) return this.$message.error("删除参数失败！");
      this.getParamsData();
      this.$message.success("删除成功");
    },
    // 文本框失去焦点或者按下回车键触发的事件
    handleInputConfirm(row) {
      // 如果输入不合法则清空内容
      if (row.inputValue.trim().length === 0) {
        row.inputValue = "";
        row.inputVisible = false;
        return;
      }
      // 如果输入内容合法则push到
      row.attr_vals.push(row.inputValue.trim());
      row.inputValue = "";
      row.inputVisible = false;
      // 发起数据请求，保存这个参数
      this.saveAttrVals(row);
    },
    // 将对sttr_vals的操作，保存到数据库
    async saveAttrVals(row) {
      const { data: res } = await this.$http.put(
        `categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(","),
        }
      );
      if (res.meta.status !== 200) return this.$message.error("添加参数失败！");
      return this.$message.success("添加参数成功");
    },
    // 点击按钮，展示文本输入框
    showInput(row) {
      row.inputVisible = true;
      // 文本框自动获得焦点
      // $nextTick 方法的作用，就是当页面上的元素被重新渲染之后，才会指定回调函数中的代码
      this.$nextTick((_) => {
        this.$refs.saveTagInput.$refs.input.focus();
      });
    },
    // tag标签关闭事件
    handleClose(i, row) {
      row.attr_vals.splice(i, 1);
      this.saveAttrVals(row);
    },
  },
  computed: {
    // 如果选择框选择了三级内容，则禁用属性关闭，反之则开启
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) return true;
      return false;
    },
    // 获取三级Id
    cateId() {
      if (this.selectedCateKeys.length === 3) return this.selectedCateKeys[2];
      // console.log(this.selectedCateKeys[2])
      return null;
    },
    // 动态计算标题的文本
    titleText() {
      if (this.activeName === "many") return "动态参数";
      return "静态属性";
    },
  },
};
</script>

<style lang="less" scope>
.cat_opt {
  margin: 15px 0;
}
.el-cascader {
  margin-left: 15px;
}
.input-new-tag {
  width: 90px !important;
}
.button-new-tag {
  height: 32px;
  line-height: 30px;
  padding-top: 0;
  padding-bottom: 0;
}
</style>